private void EnumerateDevices()
{
uint deviceCount = 0;
int dwSize = Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST));
if (NativeMethods.GetRawInputDeviceList(IntPtr.Zero, ref deviceCount, (uint)dwSize) == 0)
{
IntPtr pRawInputDeviceList = Marshal.AllocHGlobal((int)(dwSize * deviceCount));
try
{
_validHandles.Clear();
NativeMethods.GetRawInputDeviceList(pRawInputDeviceList, ref deviceCount, (uint)dwSize);
for (int i = 0; i < deviceCount; i++)
{
uint pcbSize = 0;
NativeMethods.RAWINPUTDEVICELIST rid = (NativeMethods.RAWINPUTDEVICELIST)Marshal.PtrToStructure(
new IntPtr(pRawInputDeviceList.ToInt64() + dwSize * i),
typeof(NativeMethods.RAWINPUTDEVICELIST));
if (rid.dwType == NativeMethods.RIM_TYPEHID)
{
NativeMethods.GetRawInputDeviceInfo(rid.hDevice, NativeMethods.RIDI_DEVICENAME, IntPtr.Zero, ref pcbSize);
if (pcbSize > 0)
{
IntPtr pData = Marshal.AllocHGlobal((int)pcbSize);
try
{
NativeMethods.GetRawInputDeviceInfo(rid.hDevice, NativeMethods.RIDI_DEVICENAME, pData, ref pcbSize);
string deviceName = Marshal.PtrToStringAnsi(pData);
if (string.IsNullOrEmpty(deviceName) || deviceName.IndexOf("VIRTUAL_DIGITIZER", StringComparison.OrdinalIgnoreCase) >= 0 || deviceName.IndexOf("ROOT", StringComparison.OrdinalIgnoreCase) >= 0)
{
continue;
}
_validHandles.Add(rid.hDevice);
}
finally
{ Marshal.FreeHGlobal(pData); }
}
}
}
}
finally
{ Marshal.FreeHGlobal(pRawInputDeviceList); }
}
else
{
throw new ApplicationException("Error!");
}
}
private static bool HasTabletDevices()
{
uint deviceCount = 0;
// Determine the number of devices first (result will be -1 if fails and cDevices will have count)
int result = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(null, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (result >= 0 && deviceCount != 0)
{
NativeMethods.RAWINPUTDEVICELIST[] ridl = new NativeMethods.RAWINPUTDEVICELIST[deviceCount];
int count = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(ridl, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (count > 0)
{
for (int i = 0; i < count; i++)
{
if (ridl[i].dwType == NativeMethods.RIM_TYPEHID)
{
NativeMethods.RID_DEVICE_INFO deviceInfo = new NativeMethods.RID_DEVICE_INFO();
deviceInfo.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.RID_DEVICE_INFO));
uint cbSize = (uint)deviceInfo.cbSize;
int cBytes = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceInfo(ridl[i].hDevice, NativeMethods.RIDI_DEVICEINFO, ref deviceInfo, ref cbSize);
if (cBytes > 0)
{
if (deviceInfo.hid.usUsagePage == NativeMethods.HID_USAGE_PAGE_DIGITIZER)
{
switch (deviceInfo.hid.usUsage)
{
case NativeMethods.HID_USAGE_DIGITIZER_DIGITIZER:
case NativeMethods.HID_USAGE_DIGITIZER_PEN:
case NativeMethods.HID_USAGE_DIGITIZER_TOUCHSCREEN:
case NativeMethods.HID_USAGE_DIGITIZER_LIGHTPEN:
{
return(true);
}
}
}
}
else
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceInfo failed!");
}
}
}
}
else if (count < 0)
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceList failed!");
}
}
return(false);
}
private int EnumerateDevices()
{
int numberOfDevices = 0;
uint deviceCount = 0;
int dwSize = (Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (NativeMethods.GetRawInputDeviceList(IntPtr.Zero, ref deviceCount, (uint)dwSize) == 0)
{
IntPtr pRawInputDeviceList = Marshal.AllocHGlobal((int)(dwSize * deviceCount));
try
{
_touchScreenPhysicalMax.Clear();
NativeMethods.GetRawInputDeviceList(pRawInputDeviceList, ref deviceCount, (uint)dwSize);
for (int i = 0; i < deviceCount; i++)
{
uint pcbSize = 0;
NativeMethods.RAWINPUTDEVICELIST rid = (NativeMethods.RAWINPUTDEVICELIST)Marshal.PtrToStructure(
new IntPtr(pRawInputDeviceList.ToInt64() + dwSize * i),
typeof(NativeMethods.RAWINPUTDEVICELIST));
NativeMethods.GetRawInputDeviceInfo(rid.hDevice, NativeMethods.RIDI_DEVICENAME, IntPtr.Zero, ref pcbSize);
if (pcbSize > 0)
{
IntPtr pData = Marshal.AllocHGlobal((int)pcbSize);
try
{
NativeMethods.GetRawInputDeviceInfo(rid.hDevice, NativeMethods.RIDI_DEVICENAME, pData, ref pcbSize);
string deviceName = Marshal.PtrToStringAnsi(pData);
if (deviceName != null && deviceName.IndexOf("ROOT", StringComparison.OrdinalIgnoreCase) >= 0)
{
continue;
}
if (rid.dwType == NativeMethods.RIM_TYPEHID)
{
var isTouchDevice = CheckDeviceIsTouchScreen(deviceName);
if (isTouchDevice && !_touchScreenPhysicalMax.ContainsKey(rid.hDevice))
{
numberOfDevices++;
_touchScreenPhysicalMax.Add(rid.hDevice, Point.Empty);
}
}
}
finally
{ Marshal.FreeHGlobal(pData); }
}
}
}
finally
{ Marshal.FreeHGlobal(pRawInputDeviceList); }
return(numberOfDevices);
}
else
{
throw new ApplicationException("Error!");
}
}
private static bool HasTabletDevices()
{
uint deviceCount = 0;
// Determine the number of devices first (result will be -1 if fails and cDevices will have count)
int result = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(null, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (result >= 0 && deviceCount != 0)
{
NativeMethods.RAWINPUTDEVICELIST[] ridl = new NativeMethods.RAWINPUTDEVICELIST[deviceCount];
int count = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceList(ridl, ref deviceCount, (uint)Marshal.SizeOf(typeof(NativeMethods.RAWINPUTDEVICELIST)));
if (count > 0)
{
for (int i = 0; i < count; i++)
{
if (ridl[i].dwType == NativeMethods.RIM_TYPEHID)
{
NativeMethods.RID_DEVICE_INFO deviceInfo = new NativeMethods.RID_DEVICE_INFO();
deviceInfo.cbSize = (uint)Marshal.SizeOf(typeof(NativeMethods.RID_DEVICE_INFO));
uint cbSize = (uint)deviceInfo.cbSize;
int cBytes = (int)MS.Win32.UnsafeNativeMethods.GetRawInputDeviceInfo(ridl[i].hDevice, NativeMethods.RIDI_DEVICEINFO, ref deviceInfo, ref cbSize);
if (cBytes > 0)
{
if (deviceInfo.hid.usUsagePage == NativeMethods.HID_USAGE_PAGE_DIGITIZER)
{
switch (deviceInfo.hid.usUsage)
{
case NativeMethods.HID_USAGE_DIGITIZER_DIGITIZER:
case NativeMethods.HID_USAGE_DIGITIZER_PEN:
case NativeMethods.HID_USAGE_DIGITIZER_TOUCHSCREEN:
case NativeMethods.HID_USAGE_DIGITIZER_LIGHTPEN:
{
return true;
}
}
}
}
else
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceInfo failed!");
}
}
}
}
else if (count < 0)
{
System.Diagnostics.Debug.WriteLine("TabletDeviceCollection: GetRawInputDeviceList failed!");
}
}
return false;
}
